Electrolytic condenser



De@ 26 ,1939- A. DEu'rscl-IMANN 2,184,686

ELECTROLQTIC CONDENSER Filed .June 22, mais Inventar @Y Mw Patented Dec. 2,6, 1939 UNITED STATES ELEc'rnoLY'rIc coNnENsEn Arnold Deutschmann, Brookline, Mass., assignor to Tobe Deutschmann Corporation, Canton,

Mass.

Applicatie June zz, 1986,` serial No. 86,490

1 Claim.

The present invention relates to the construction of condensers and in particular to the construction of electrolytic condensers of the liquid type, particularly the type where the liquid has 5 considerable viscosity, although it is still liquid enough to offer difficulties 1n construction and use due to the penetration of the liquid in the containing casing.

Considerable difculty in the design of electrolytic condensers is experienced in the diiiiculty of preventing the electrolyte from leaking out of the endsof the condenser and causing corrosion of the connecting parts. Not only is there mechanical leakage as a result of such construction,

but there also results when the mechanical leak age occurs considerable electrical leakage which tends to deteriorate the condenser itself and bring about a more rapid breakdown than would normally beexpected.

In order to make condensers of inexpensive construction, various means have been employed,

such as the use of paper containers, but in most f of these constructions leakage is found, and if the electrolyte itself must maintain its proper percent of moisture, such leakage may finally bring about a drying up of the condenser, causing either a breakdown or a serious loss of capacity. Due also to the fact that it is usual to employ copper conductors as external leads and aluminum connectors as internal leads, electrolysis is apt to occur where moisture is present and as a result, chemical action may take place ultimately breaking down or corroding the places of connection.

In addition to this, it frequently happens due to the change of temperature conditions and change of manner of operation of the electrolytic condenser itself, that breathing or expansion and contraction takes place in the winding of the condenser in such a way that frequently the casing is ruptured in places allowing more or less free flow of the liquid out of the casing.

The present invention overcomes all of the dilculties mentioned above, and in doing so, provides a condenser which may be cheaply constructed'without any substantially greater labor than many of the other types of condensers and in most cases with much less dilculty than the electrolytic condensers previously used in the art.

Without enumerating further details and advantages gained in the method of the present construction, and in the condenser resulting therefrom, the invention will be more fully described in connection with the drawing, illustrating an embodiment of the same.

The drawing shows the invention as applied to a tubular electrolytic condenser which may be almost any desired size, but is usually of the smaller type adapted to be used in radio sets or with small motorsor the like.

In the drawing, the winding itself is illustrated as I. This winding may comprise sheets of aluminum foil 2 and 3, shown' in the broken away portion, separated by paper or gauze spaces 4, sc that the foils I and 3 are always maintained apart 10 from each other, one foil as 2 for instance forming an anode and the other foil 3 as the cathode of the electrolytic condenser.

' The whole winding is usually held together by means of an elastic band 5 placed around the 15 winding. At each end of the condenser there is placed a terminal strip 'I and 8 respectively, the strip 'I being foldedv under the end edge of the foil 2 and the strip 3 being placed next to the foil 3, the Strip 8 being supported on cores yfrom the 20 foil 2' by means of the gauze or paper space .4. The winding is loosely fitted into the containing cylinder 9 which is preferably made of asphalt treated paper or cardboard. The space provided between the winding I and the cardboard asphalt 25 treated cylinder 9 is such' as will allow proper expansion of the winding itself as mentioned above. The ends of the cylinder 9 are closed by 'means of fibre washers I0 and. I I. These washers fit closely into-the ends 'of the cylinders 9 and 30.

maybe provided at the edge with a space suflicient to allow the terminal strips 'I and 8 to pass between the wall of the cylinder and the edge. of the washers. I

When the winding is assembled and properly 35 treated the end washers are put in place, the strips being passed betweenthe edge of the4 washer and the cylinder or shell 9. At the ends ol Lthe terminal strips external of the washers, are placed lead rivets I2 and I3 to which are soldered copper conductors I4 and I5. The end terminals of the strips 'I and 8 together with the rivets I2 and I3, and the connecting ends to the conductors I4 and I6 are sealed with a wax tight seal I6 and I'I which may be of a high melting point 45 adhesive type wax, not only sealing the ends of the condensers from leakage of moisture, but preventing `the electrolyte from reaching or affecting the terminal connections so that corrosion and electrolysis is completely avoided. 50'

The seals I6 and Il after becoming hard also serve as a protection ani support for the tube or cylinder 9. The ends of the wax may be capped by means of a second set of libre washers I8 and' I9, which may be inserted at such a time as-to 55 become adhesive to the wax fillings and therefore remain firmly in place. The inner shell 9 is covered with an outer shell 2|! which may be a wax treated paper of substantial thickness as indicated with the ends rolled as indicated respectively at 2| and 22 in such a manner as to retain the iibre washers 23 and 24 which may be sealed in wax in the ends of the tube or shell 20. The shells or containers 9 and 20 provide a laminated structure which when both tubes are treated with asphalt and wax or the like, provide a moisture-proof construction o! suiilcient durability to stand practically all heavy use or mechanical blows, to which the condenser might be subjected in use.

In addition to this, as has been remarked above, the end terminals are so eiiectively separated one from the other and sealed o!! from any moisture or chemicals so completely that no leakage cur-v rent is present from one terminal to the other resulting therefore in a condenser construction of a great utility.v

It should also be noted that the washer construction comprising the outside and internal -washers particularly the external washer spaced at a distance from the point oi junction of the conductingl wire of the lead rivet attached to the aluminum strip protects the conducting wire in such a manner that the open circuit at the point of connection is hardly possible. In addition to this the wire being supported'by the external brought out externally at the ends of the tube,

.two discs fitting within the inner tube one against eachl end of the condenser winding, a wax-sealing compound positionedV next to said discs and sealing inner tube, a second disc next to said wax seal within the inner tube, a further disc applied over the ends of the inner tube within the outer tube, the outer tube being crimped over at its ends upon the last-named disc.

ARNOLD DEUTSCHMANN. 

